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Crosswise Phthalocyanines with Collinear Functionalization: New Paradigmatic Derivatives for Efficient Singlet Oxygen Photosensitization
摘要： We describe here the preparation of a number of trans-ABAB Zn(II) phthalocyanines (ZnPcs) 1a-g, which combine several interesting features. First, these compounds present high solubility and hindered aggregation, due to the functionalization of two facing isoindole constituents (B) of the ZnPc with bis(trifluoromethylphenyl) units. Second, the other two isoindoles (A) hold extra-annulated phthalimide units containing different substituents in the nitrogen positions, this feature resulting in a collinear arrangement of a variety of functional groups. Some of these collinearly functionalized ZnPcs are interesting building blocks for constructing either homo- or heteroarrays containing ZnPc units. On the other hand, the amphiphilic nature of some members of the series renders them interesting candidates for photosensitization of singlet oxygen. Photophysical studies on ZnPc 1c, selected as model compound of the series, have proven these molecules efficient singlet oxygen photosensitizers in both polar and apolar media, with 1O2 quantum yields (ΦΔ) as high as 0.74.
关键词： photophysics,phthalocyanine,fluorescence,collinear functionalization,singlet oxygen
更新于2025-09-19 17:15:36
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Reversible Charge Transfer with Singlea??Walled Carbon Nanotubes Upon Harvesting the Low Energy Part of the Solar Spectrum
摘要： Here, the ability of a novel near-infrared dye to noncovalently self-assemble onto the surface of single-walled carbon nanotubes (SWCNTs) driven by charge-transfer interactions is demonstrated. Steady-state, Raman, and transient absorption spectroscopies corroborate the electron donating character of the near-infrared dye when combined with SWCNTs, in the form of fluorescence quenching of the excited state of the dye, n-doping of SWCNTs, and reversible charge transfer, respectively. Formation of the one-electron oxidized dye as a result of interactions with SWCNTs is supported by spectroelectrochemical measurements. The ultrafast electronic process in the near-infrared dye, once immobilized onto SWCNTs, starts with the formation of excited states, which decay to the ground state via the intermediate population of a fully charge-separated state, with characteristic time constants for the charge separation of 1.5 ps and charge recombination of 25 ps, as derived from the multiwavelength global analysis. Of great relevance is the fact that charge-transfer occurs from the hot excited state of the near-infrared dye to SWCNTs.
关键词： doping,charge transfer interactions,noncovalent functionalization,near-infrared dyes,carbon nanotubes
更新于2025-09-19 17:13:59
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Application of carbon dots in dye‐sensitized solar cells: A review
摘要： Carbon dots (CDs) are a kind of zero-dimensional carbon-based nanoparticles with superb light-trapping ability, high optical absorption ability, and superior intrinsic catalytic activity. Due to these advantageous properties, they have received enthusiastic attention from researchers in the field of optical devices. The application of carbon dots in dye-sensitized solar cells has increased with steady steps recently, especially as a substitute for precious Ru-sensitizers and Pt counter electrodes. In this review, we classified the application of carbon dots in dye-sensitized solar cells in recent years and explained the mechanisms of improving the performance of carbon dots. The significant impact of surface functionalization of CDs on the performance of dye-sensitized solar cells was discussed. Lastly, some challenges and application prospects of carbon dots in the dye-sensitized solar cell were proposed, which is meaningful for the further exploration and application of carbon dots as a new energy material.
关键词： sensitizer,counter electrode,carbon dots,surface functionalization,dye-sensitized solar cells
更新于2025-09-19 17:13:59
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Laser-assisted surface processing for functionalization of polymers on micro- and nano-scale
摘要： Rapid manufacturing of functionalized polymers enable a cost-ef?cient method for many applications in the biological, and medical sector. Laser structuring techniques differ for fast fabrication processes of thermoplastics. Here we report on direct UV laser ablation of polystyrene and polydimethylsiloxane to control wettability and bio-compatibility. For this purpose contact angle measurements and L929 cell growth experiments were performed as function of laser and process parameters. This work also describes the potential of laser-assisted hot embossing which has been introduced to replicate pre-fabricated micro- and nano-sized structures onto polymers proving it to be a cost-ef?cient and ?exible method for surface functionalization. Therefore, pre-fabricated laser-induced periodic surface structures have been manufactured as mould inserts using ultrafast laser radiation near the ablation threshold. These mould inserts can also be made of nickel, silicon or glass proving laser-assisted hot embossing to be a versatile tool for the functionalization of thermoplastics and meet the requirements for modern manufacturing with regard to quality and production ?exibility.
关键词： Bio-compatibility,Functionalization of polymers,Wettability,Laser-assisted surface processing,Laser-assisted hot embossing,Micro- and nano-scale
更新于2025-09-19 17:13:59
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Exploration of the Potential Efficacy of Natural Resource Derived Blue Emitting Graphene Quantum Dots in Cancer Therapeutic Application
摘要： Coal is the most abundant natural resource being used worldwide and shows graphite-like clusters. Here, we report an innovative and cost effective oxidative functionalization approach followed by acid-free and oxone oxidant-assisted solvothermal synthesis of graphene quantum dots from coal for the first time. This oxidative functionalization method of coal has been performed through heat treatment of nitric acid followed by acid recovery process. Indeed, solvothermal method is entirely free from the utilization of strong acids; and involves a simple, eco-friendly, and salt free purification process with high production yield (~45%). Due to the synergistic synthesis technique, our developed GQDs are found to exhibit a strong blue photoluminescence (PL) characteristic with significantly high quantum yield (~14.42 %). High resolution Transmission electron microscopy (HRTEM) images indicate that nanocrystalline GQDs have uniform and narrow particle size distribution in the range of 2.5-5 nm. The anticancer efficacy of the synthesized GQDs nano material is validated through cellular morphological pattern analysis and DAPI stain images of neuroblastoma cell and breast cancer cell. Additionally, the alteration of mitochondrial membrane potential is scrutinized using JC1 micrographs. Interestingly, RITC tagged GQDs are showing cellular internalization within breast cancer cells. The robust functionality, luminescence stability, nanosecond lifetime, biocompatibility and low toxicity of our developed GQDs enable them to be promising probes for cancer therapeutic applications. This study unveils new opportunities for sustainable production of GQDs with novel attributing features because of the easily available of raw material, cost-effective productivity and fascinating photoluminescence property.
关键词： Oxidative functionalization,Coal,Cancer cell,Photoluminescence,Solvothermal synthesis
更新于2025-09-19 17:13:59
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Nitrogen‐functionalized Graphene Quantum Dots: A Versatile Platform for Integrated Optoelectronic Devices
摘要： Over the past 10 years, graphene quantum dots (GQDs) have grown into a highly innovative optical material in various research fields including electronics, photonics, biotechnologies, etc. With the increasing implementation of GQDs in these fields, GQDs with tunable optical properties will emerge that could be especially suitable for applications in the field of integrated photonics. Herein, a short summary of the recent state of our research on the development of nitrogen-functionalized GQDs with tunable optical properties and their integration into photodetectors is given.
关键词： Optical properties,Photodetectors,Chemical functionalization,Graphene,Graphene quantum dots
更新于2025-09-19 17:13:59
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Ultrashort Pulsed Laser Surface Patterning of Titanium to Improve Osseointegration of Dental Implants
摘要： Ultrashort pulsed direct laser interference patterning (DLIP) is used to generate hierarchical line-like patterns on titanium surfaces to control cell adhesion and spreading on dental implants, thereby improving osseointegration. The DLIP structures have spatial periods of 3, 5, 10, and 17 μm. They are produced using a laser source with a pulse duration of 10 ps and cumulated energy densities between 0.1 and 78.9 J cm?2. Laser-induced periodic surface structures (LIPSS) and submicron features are obtained on the treated samples. The DLIP treatment leads to the development of a thick titanium oxide layer, which is imaged and quantified using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Several days (30–56) after the laser treatment, specimens with larger spatial periods are hydrophilic, whereas samples with spatial periods of 3 μm are hydrophobic. Seeded human osteoblasts on the laser-structured samples show 2.5 times higher cell numbers after 7 days in vitro culture compared with osteoblasts on a grit-blasted and etched reference sample. Finally, cell adhesion to a structured 3D dental implant is demonstrated.
关键词： dental implants,surface functionalization,direct laser interference patterning,osseointegration,titanium
更新于2025-09-19 17:13:59
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Silicon‐Based Laser Desorption Ionization Mass Spectrometry for the Analysis of Biomolecules: A Progress Report
摘要： Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is widely used in the biomedical field for the label-free analysis of molecules such as drugs, lipids, peptides, proteins, and biological tissues for molecular imaging. However, organic matrices used in traditional MALDI-MS applications introduce excessive interferences in the low m/z range. For this reason, nanostructured materials—and in particular silicon-based LDI strategies—have become a promising alternative, since they provide a much weaker background. Herein, the recent developments in fabrication, functionalization, and practical applications of silicon-based LDI-MS methods are reviewed. Also the basic requirements of silicon-based substrates for optimal LDI analysis by providing an overview of the LDI mechanisms that use silicon-based substrates instead of organic matrices are reported. Finally, the considerable potential of silicon-based substrates is discussed, giving suggestions for topics for future research.
关键词： silicon nanostructures,laser desorption ionization (LDI),surface functionalization,mass spectrometry imaging (MSI)
更新于2025-09-19 17:13:59
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Octupolar Plasmonic Nanosensor Based on Ordered Arrays of Triangular Au Nanopillars for Selective Rotavirus Detection
摘要： Technologies based on plasmonic nanostructures are a rapidly growing field that aims to be a valid alternative to conventional diagnostic tools. One of the main goals in their technological development, consists in the design of systems for a sensitive and specific detection of pathogens in water. Among these, Rotavirus represent the main cause of childhood viral gastroenteritis in humans. In this work, we design functionalized plasmonic label-free nanosensors based on Localized Surface Plasmon Resonance (LSPR) sensing to detect ultralow concentration of Rotavirus. We demonstrate the possibility to detect in a specific way amounts lower than 103 plaque forming unit (PFU)/mL of the Rotavirus in water using a very low sample volume (2 μl). These results together with those obtained in our specificity tests performed with two different viruses (Bovine Herpesvirus -BHV1 and Equine viral arteritis -EVA) confirm that our device is very promising to develop a rapid, simple, very sensitive and specific immunoassay for detection of Rotavirus. To the best of our knowledge, this is the first time that LSPR nanobiosensing has been used for the sensitive and specific detection of Rotavirus.
关键词： Functionalization,LSPR,Rotavirus,Nanosensors,Plasmonic
更新于2025-09-19 17:13:59
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Ultra-fast laser micro processing by multiple laser spots
摘要： In the direct processing of three dimensional micro structures for surface functionalization, usp-lasers provide the necessary resolution and quality. The increasing resolution brings along a rising machining time which leads to the unavoidable demand of multiple spots. In this paper a newly developed high compact ps-laser with repetition rates of up to 8 MHz and an average power of 500 W was distributed by a diffractive element on a 16 channel acousto optical modulator that individually modulates each of the 16 spots. The typical laser based micro processing method was enhanced to reach a machining technology in which 16 different layers could be processed within one path. In a further step, 4 of these high compact beam deliveries could be integrated in one cylinder micro processing system to generate at least 64 individual acting laser spots. Different functional structures were processed and shown in this paper.
关键词： surface functionalization,Three dimensional micro strucutures,Mulit-Spot,Diffractive Optical Element DOE,usp-laser
更新于2025-09-16 10:30:52